Incorrect.
Below 250g you are must less restricted with where you can fly.
From the CAA:
- Drones under 250g can be flown in the A1 sub category (there are also some exceptions for drones up to 500g too).
- Drones less than 2kg can be flown in A2 sub category, but you must keep at least 50 meters away from people and pass the A2 theory exam (A2 Certificate of Competency or ‘A2 CofC’). If you have not passed the A2 theory exam, you may only fly these drones in the A3 subcategory.
- Drones of 2kg or greater may only be flown in the A3 subcategory.
The 3 categories:
- A1: Flying ‘over’ people;
- A2: Flying ‘close to’ people;
- A3: Flying ‘far from’ people
So, a Mavic Mini can fly in the A1 category but you must register yourself a flyer ID and take a simple online test (because it has a camera).
A Mavic Air 2 etc, can only fly in the A2 category if the operator holds an A2 CofC. Otherwise it's A3.
This is the main reason I own a Mini 2 as well as an Air 2S. Even though I hold an A2 CofC there are many more places I can fly the mini where I can't legally fly the Air 2S.